Please, follow the instruction from MSDN:
Remove or Delete an Item or Project - SQL Server | Microsoft Docs[
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Quote:
To remove a project item:
- In Solution Explorer, select the project item you want to remove.
- On the Edit menu, click Remove.
- On the confirmation dialog, click Remove to remove the item from the project.
A removed item still exists on the file system. Therefore, you can add a removed item to its original solution or to another solution.
[EDIT]
IF you can not locate file and you're able to see it in the left pane, go to:
Tools->Options->Projects and Solutions->Track Active Item in Solution Explorer
If above is inaccessible, follow the instruction from:
Visual Studio Tip #8: Adding existing files with Show All Files – The Brain Dump[
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Then you'll be able to remove that files from solution explorer.
Finally, you can always show all files:
Solution Explorer doesnt show the folder although the folder is present in my local drive (local copy) Visual studio - Stack Overflow[
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Good luck!
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